code: def _line_func_2(self, x):
      self.fcount += 1
      f = np.dot(x, np.dot(self.A, x)) + 1
      df = np.dot(self.A + self.A.T, x)
      return f, df
  
imports: from __future__ import division, print_function, absolute_import
  from numpy.testing import assert_, assert_equal, assert_array_almost_equal, assert_array_almost_equal_nulp, assert_warns
  from scipy._lib._numpy_compat import suppress_warnings
  import scipy.optimize.linesearch
  from scipy.optimize.linesearch import LineSearchWarning
  import numpy
label_desc: Use image node_id 5 for calling the TestLineSearch obj's underlying member method code with example usage: obj._line_func_2(x) and returns: f,  df